If customers arrive according to a Poisson process with an average arrival rate of 10 customers per hour, what is the approximate probability of having more than 10 arrivals in an hour? (Answers are rounded to multiples of 10 - choose closest answer). (Note - this is not a 'Waiting Lines' question that uses the Excel template, but rather is a question about Poisson arrivals and would use the Poisson equation seen in the lab, text and in class. You will most likely require a spreadsheet to be efficient in answering this question).

	a.	0.20
	b.	0.30
	c.	0.50
	d.	0.40